It is London in 1136, and the great wooden bridge over the mighty Thames has been consumed by fire. Soon, the cleric Peter de Colechurch plans to build a new, fortified bridge made of stone on which several buildings can be built over the years. Players are architects who are each responsible for part of the (new) "Old London Bridge".

By playing character cards, you contribute to the construction of the game's 3D bridge. Buildings must be built with house numbers in them. Each house has a coat of arms that grants special abilities, new character cards and increases the player's income. The architect with the most money at the end of the game is the winner.